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      12-14-2013, 08:29 AM   #68
mkoesel
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Drives: No BMW for now
Join Date: Jun 2006
Location: Canton, MI

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The S55 has identical compression ratio and displacement to the N54 and N55. It has two mono-scroll turbos that appear to be very similar to those used by the N54. Like the N55 it has Valvetronic which the N54 lacked. It also has a new closed deck block and stronger forged crankshaft that the other two engines do not have, and it is designed to run 600 RPM higher than those engines as well.

With that in mind, it is my guess that the S55 will be able to at least equal the highest output FBO tuned N54s out there, when modified similarly. Those are at, what, 470 whp or thereabouts?